Following the successful deployment of millimeter-wave (mmWave) communications in fifth-generation (5G) wireless systems, the terahertz-(THz) band is being investigated as an enabler that supports larger bandwidths between \(0.3\)  and \([10]{THz}\)  in 6G and beyond. However, in addition to the gap in THz device technologies, several THz signal processing challenges should be first overcome [1]}. THz signal propagation results in narrow beams, high path losses, low diffraction, high scattering, high sensitivity to blockages, and significant differences between line-of-sight (LoS) and non-line-of-sigh (NLoS) path gains [2]}. Infrastructure enablers such as multiple-input-multiple-output (MIMO) technology can mitigate such problems by packing many antennas in arrays of tiny footprints at the transmitter and the receiver, enhancing the beamforming and multiplexing gains despite the ill-conditioned channels (see [1]} and references therein).
